Bond, J. 1955. Notes on Peruvian Coerebidae and Thraupidae. Proceedings of the Academy of Natural Sciences of Philadelphia 107: 35–55.

Bond, J., and R. Meyer de Schauensee. 1942. The birds of Bolivia. Part I. Proceedings of the Academy of Natural Sciences of Philadelphia 94: 307–391.

Burns, K.J., and R.A. Racicot. 2009. Molecular phylogenetics of a clade of lowland tanagers: implications for avian participation in the great American interchange. Auk 126: 635-648. https://doi.org/10.1525/auk.2009.08195

Burns, K.J., and A.J. Shultz. 2012. Widespread cryptic dichromatism and ultraviolet reflectance in the largest radiation of Neotropical songbirds: implications of accounting for avian vision in the study of plumage evolution. Auk 129: 211–221. https://doi.org/10.1525/auk.2012.11182

Stone, W. 1899. A study of the type specimens of birds in the collection of the Academy of Natural Sciences of Philadelphia, with a brief history of the collection. Proceedings of the Academy of Natural Sciences of Philadelphia 51: 5–62.

Weske, J.S. 1972. The distribution of the avifauna in the Apurimac Valley of Peru with respect to environmental gradients, habitat, and related species. Ph.D. thesis, The University of Oklahoma. Available at https://shareok.org/handle/11244/3377.

Wiley, R.H. 2010. Alfonso Olalla and his family: the ornithological exploration of Amazonian Peru. Bulletin of the American Museum of Natural History: 1–68. https://doi.org/10.1206/677.1